Stamp-mill or the like.



`M. R. OI'SHAUGHNESSY.

STAMP MILL 0R THE LIKE.. APPLICATION FILED AUG. 16, |915.

Patented May14, 1918.

2 SHEETS-SHEET l.

Zin/mrd Hammam/1255K M. R. OSHAUGHNESSY.

STAMP MILL 0R THE UKE.

APPLICATION FILED AUG-16. |915- Patented May14, 1918.

2 SHEETS-SHEET 2.

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ymill mortar formed insubstantiallyv rectan- UNITED STATES PATENTOFFICE.

MARTIN RODERICK OSI-IAUGI-INESSY, OF COBALT, ONTARIO, CANADA.

STAMP-MILL OR THE LIKE.

Specication of Letters Patent.

Patented May 14, 1918.

Application filed August 16, 1915. Serial No. 45,835.

To all whom z't may concern Be it known that I, MARTIN R. OSHAUGH-nessi', a subject of the King of Great Brit.- ain, and resident ofCobalt, in the Province of Ontario, Dominion of Canada, having in-`vented certain new and useful Improvements in Stamp-Mills or the like,do hereby declare that the following is a full, clear,

land exact description of the saine.

The invention relates to improvements in stamp mills or the like, asdescribed in the present specification, and illustrated in theaccompanying drawings that form part of the same. v

The invention consists essentially of the improved constructionparticularly described andset forth in the following specication andaccompanying drawings forming part of the saine.v

- The objects of the invention are to devise a stamp mill of simple anddurable construction which shall have increased efliciency yand outputover these already in general use and co-incidentally lengthen the lifeof the stamps, shoes and screens, and further main- .tain the severalparts, especially the screen in a clean operative condition.

Inthe drawings v .Figure 1 is a perspective view of the mortar havingportions thereof broken away.

Fig. 2 is a cross sectional view through the mortar as shown in Fig. 1

Fig. 3 is a perspective detail view of the mortar chuck.

Fig. 4 is a perspective detail view of the bearing bracket of thereservoir partly broken away.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1` is a stamp gular shape,and having the dies2 arranged at intervals therealong at the bottom thereof, and the stamps3 arranged with the shoe 12() attached there-above, to dropintermittently on the dies.

The mortar box 1 has the opening 4 along the front thereof and in whichis fitted the screen 5, which is customarily set at a slight.

yangle outward at the top. The above parts are in general common tostamp mill equip- Vment and construction and in the operationofthe mill,crushed ore is fed in the required `quantities to the' stamps through asuitable opening at the back of the mortar, in such manner that the orefalls on thecrushing surface of the dies and is reduced thereon by theconstant raising and dropping of the operating stamps. To assist thepulverized mass from the mortar through the screen 5, water or millsolution is supplied with the ore1 in sufiicient volume to wash outthrough screen 5, the ore sufficiently reduced lto pass said screenyopenings or orifices, the discharged sliine, sandand solution, etc.,drops from screen to a receiving lauiider and is thus conveyed frommortar.

Under ordinary conditions the mill solu-l tion consisting of water,cyanid or the like, supplied for the double purpose of washing Aandassisting in the expulsion of the pulthis clogging or choking theeffective discharge area of the screen is gradually reduced at itsmosteffective discharge points, namely points on the screen surfacewhere the direct wash of the operating stamps is directed. The closingof the screen at these points on screen surface immediately aects thegeneral internal operating conditions causing excessive sliming of theore atthe expense of capacity, and also interferes with the properclearance of the crushing surface ofthe dies due in a great measure toexcess slimed pulp retained behind screen, bringing vinto practice acondition of operating mortar whereby vthel important washing influenceof the mill solution is practically lost on the surface of the dies,resulting in dry crushing on the surface of the dies, which ifcontinued, even for a short period converts the crushing surface of thedies into irregular or very uneven surfaces, a very undesirablecondition where the life of the wearing parts and the capacity of thestamps are valued. In this arrangement of stamp mill there is of coursea maximum output, which in practice has been fairly determined andbrought. to a standard throughout the various mills in use. It is togreatly increase the tonnage capacity and improve the operatingconditions that this invention has to do. I have determined that it is adecided advantage to intermittently change the volume of mill solutionsupplied to mortar for the double purpose of washing and conveying thereduced ore from the stamps; that is, at one brief period reducing thevolume of solution supplied to probably fifty per cent. the requiredvolume so that the ore being reduced under the stamps approaches athickened or pa'sty likev product during the short solution period, thereduced volume of solution present gives the dropping stamps a moreeffective chance to reduce the ore, immediately following the shortsolution period to flood the interior of mortar to any desired height onscreen found, best suited for character of ore being reduced by thestamps, The flooding of the interior of the mortar sets up through theaction of the stamps active energetic washing influences that readilyexpels the sulficiently reduced ore from the mortar through the screen,and the mill solution controlling devices as hereinafter described `keepthe clearance of the screen assured through lengthy operating` periods,and in so doing materially assist in maintaining the proper andefficient clearance of the crushing surL face'of the dies, an allimportant condition whereby satisfactory operating conditions arevalued.

The mortar, as also the spigot trough 6 is supplied with a mill solutionto a height as shown in the drawings, that is, slightly over the diesand bottom of the screen, so that the reduced ore is washed about withthe splash of the dies and worked through the screen into 'the spigottrough; the regulardropping of the stamps one after the other along themortar, setting up a continuous hammering on the dies, so that theagitation of the solution about the'diesis constant to a normal degree,and the flow of the same in the spigot trough normal and' at apractically normal level.

' the/increasedoutput of the 'stamps I4 arrange for the flooding of thescreen intermittently by sending a wave through the screen, or byintermittently flushing the said screen on either the inside or theoutside in any desired manner, though preferably by the simplearrangement and construction of parts as hereinbefore described.

On the front of the mortar and immediately above the spigot box theflood trough a line adjacent to the front of the box above the saidfalse bottom, and having the flap damper la hingedly secured along theupper edge thereof whereby said damper may be tilted in relation to thebottom 9 to regulate the extent of the opening between said bottom 9 andthe false bottom 18.

The mortar 1 along the front thereof and immediately above the falsebottom 13 of the flood trough has the inlet openings 15 through whichthe stamps are supplied with solution as hereinafter described.

Other forms of intermittent vfeeding devices may be utilized forregularly supply ing 'an' extra quantity of solution to the stamps, andthe form shownv in the accompanying drawings is only illustrative of asimple device and comprises a reservoir trough 16 extending along theflood trough and having the endtrunnions 17 journaled in the bearings 18of the bearingvbrackets 11 hereinbefore referred'to. Said reservoirtrough has an open top and is substantially circular in cross sectionaround the bottom, but one of the longitudinal walls of the trough isformed straight as shown at-19 whereby when the trough is filled to acertain height with solution the contents thereof will over balance thetrough and cause it to tilt and discharge the contents thereof, due tothe over balance, as is well known in devices of this kind.

Solution is supplied to the flood trough from the feed pipe 20, saidpipe however` preferably being branched into the pipe721 extending overthe reservoir trough, the passage of which is controlled by the valve22. A pipe 23 extends along the flood trough immediately above the inlet15 of the mor-. v

tar, and is provided with a valve 24;'and a pipe 25 extends along theflood trough immediately'above the damper 14 which coutrols the openingbetween vthe false' andthe real bottom of 'the trough, the'pipe 25beingr provided with avalve 26.

y In theoperation of the stamp mill the stamps lare dropped uponthe diesin a regular manner, and the valve z22 supplied solution through thepipe 21 to the reservoir trou h 16, said trough having a suitable num erof orifices 27 in the bottom thereof whereby the solution willimmediately flow yinto the false `bottom 13 and through the inlet orice15 into the mortar about the quantity to moistenzthe ore'being reducedto ditions 'is remarkably' thorough, though it bring the saineto a pastycondition, but not being sucient to wash' away the -iner particles. v 1'The reducing ofthe ore under such conwould be entirely impracticable toallow such conditions to continue uninterrupted.

' Thereduced ore must have sufficientsolution to carryit` away and thisvis automatically supplied, as the reservoir trough lille, due tothesolution flowing thereunto fasterthan itis ldischarged through theoutlets 27, so that when, the trough tilts, a wave "of solutionrlowsdown the false bottom 13 of the flood trough, throughy the`inlet'openings lintothemortar and washes away the thoroughly reducedore.'

`Coin'cidentally', the flooder wave ofsolution from 'the reservoirtrough partly :passes down'the `bottom 94 or the `flood `f trough,through the .opening y regulated by the damper 14 of the falsebottom,and this solution'passing' down the bottom 9, dashes B5 against Aandthrough the screen of the mortarfroni the voutside thereof, washing the"same and assisting in the agitation of the l,water within the mortar.

A. On the continued operation .of the stamps,

an outward wave or' solution: occurs and- "passes throughA the screenand thoroughly Aflushes the mortar and vcarries loff all the orewhichhas been thoroughly reduced into the 'f spigot trough from which itreadily passes through the overflow dischange pipe 27.

ToV aidthe flushing of themortar I place' a chuck'or'ledge strip 29along the mortar immediately in front of the shoes v'2, and

thisfchu'ck, isv beveled upwardly from the front of the vshoes to the'screen opening 5. This chuck`29 is bolteditothe front of thef mortar bysuitable bolts30 extending outwardly from the chuck vthrough the' slots31 in the front of thenmortarywhereby the height of the chuck maybeadjusted. v Thischuck directs Athe liquider solution within the mortaragainst the screen, and

thereby assists in the quick and uninter? rupted discharge of thesolution from the said mortar.

The general arrangement of the several parts of the invention ashereinbefore described renders the complete mill most eicient, andparticularly the intermediate 1 passage through "the battery screen.st'amps,`said 'solution iowing in a sufficient f `fi`oo`ding E 'of themortary box 1 eeotively v washes theV thoroughly disintegrated solidsfrom the mass being reducedin' the stamps, and further effectivelyexpelsy such disintegrated particles,- and the solids after they have,throughv the action of: the stamps 'above"construction, and many'apparently widely different embodiments of my invention within thevscope of the claims, constructed without departing from the spirit orscope thereof, it is intended that all'mat- 'ter containedin the abovespecification land accompanying `drawings be interpreted as'illustrative, and'not in a limiting sense.

What I claim as Amy invention is :e 1. In combination, a receptacle:with a side'screen, a vstationary flood trough ladcjacenttos'aidreceptacle and leading to said screen, andv a tilting trough4adapted to discharge in said lflood trough, said nood 1 trough havingapivoted false bottom adapted to discharge material therefrom into saidreceptaclev above said screen.

` 2. `In 'combinationfa receptacle with a side screen, astationaryvflood trough adjacent to said receptacle and leadingto'said screen',-and a tilting trough curvilinear Yin cross section ai-jthe'bottom andone'of the ylongitudinal walls, 'the other longitudinal walls "being:formed straight whereby when the tilting trough is il1ed,"itwilloverbalf iance'and vdischarge inf'said Vflood trough, ysaid flood troughhaving a; pivotedf false bottom" 1adapted to discharge materialtherefrom into said receptacle aboveV saidscreen. 3. In combination,afreceptacle `"with a 4`side screen, vstationary flood trough' fad-Jacent to said receptacle and leadingtofsaid screen, and va' tiltingtrough* in the said flood trough vadapted to be' automatically tiltedunder/gravity and intermittently fill 'the flood` trough, and-meanslocated `adj acent'tofthef bottom off-the hood trough-whereby thematerial from'the trough is dis- "charge'd into the' receptacle abovesaidscreen and through said"'sfcre'en;v 'f f' i 4.1.x 'samp minvComprising' a' morta-tm,

" stamps operatively arranged in vsaid mortar box, a discharge screenarranged in a suit- ,able opening in said mortar box, va' flood trougharranged along the exterior of said mortar box, a dividing platearranged in said iood trough, means of communication from one side ofsaid dividing plate to the interior of said mortar box and means ofcommunication from the other side of said dividing plate to the exteriorof said screen,

